Which route does blood take around the body?
1 )
pulmonary artery → heart → aorta → lungs → pulmonary vein → heart → vena cava
2 )
pulmonary vein → heart → lungs → aorta → pulmonary artery → heart → vena cava
vena cava → heart → pulmonary artery → lungs → pulmonary vein → heart → aorta
4 )
vena cava → heart → pulmonary vein → lungs → pulmonary artery → heart → aorta
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